Category Archives: Thermal biomass. conversion and utilization —. Biomass information. system

Water

Water is variously claimed to be completely miscible at up to 30% or 55% by weight of total liquid, above which an aqueous layer separates. Any water that does separate must be carefully managed as it will be heavily contaminated with dissolved organics and require extensive treatment before disposal. Utilisation and consideration of oil on a "wet" basis, therefore, seems […]

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UNIVERSITY OF LAVAL, CANADA

5.17.1 Summary The objective of this project was to investigate the potential of low pressure pyrolysis of biomass to produce high yields of condensable vapours and selectively condense fractions from different sections of the reactor to examine the potential for fractionation and recovery of chemicals. The reactor is a 30 kg/h multiple hearth furnace operated under vacuum. A range of […]

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ANALYTICAL MODELS FOR LARGE PARTICLES

For small particles the kinetics are sufficient to predict the reaction rate. However, for large particles, both the physical and the chemical changes are essential for obtaining a global pyrolysis rate. To formulation an analytical pyrolysis model, the known parameters that can influence the pyrolysis process must be considered. These affect the energy and mass flows into and out of […]

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Feed problems

Fast pyrolysis requires high heating rates. As biomass has a low thermal conductivity, high heating rates throughout the particle either result from small particle sizes or erosion of the char product from around the particle as it pyrolyses as occurs in ablative pyrolysis (see Chapter 2 and 3). The current view of the maximum size feasible for fluid bed or […]

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CATALYTIC UPGRADING OF LIQUIDS

The crude primary liquid product from flash pyrolysis contains very high levels of oxygen which give the product some unusual characteristics including water miscibility and temperature sensitivity as described above. While the oil can be used directly in a number of thermal and power generation applications, this is considered to be unsuitable in some demanding applications such as turbines and […]

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PRODUCT CHARACTERISTICS

3.4.1 Product quality The complex interaction of time and temperature on liquid product quality has not been explored, at least partly because the characteristics of pyrolysis oil for different applications has not been defined and there is no "standard" pyrolysis liquid. It is this definition of oil quality that is a major uncertainty and requires to be defined by potential […]

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CPERI, GREECE

CPERI have been investigating the extraction and upgrading of phenolic components in fast pyrolysis liquids for several years. A small fluid bed pyrolyser has been operated to produce liquids (16, 17, 18) from which phenols are extracted then converted into methyl aryl ethers as possible fuel additives (19, 20, 21). The focus of the work has been in chemicals recovery […]

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CONCLUSIONS AND RECOMMENDATIONS

Production of primary liquids by fast pyrolysis of biomass has been commercialised at a small scale in Canada and has been actively and extensively developed throughout Europe. Some of the early problems with liquid quality are being successfully addressed and rapid progress is being made in producing a liquid that will satisfy most applications. There are many aspects of the […]

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